Furnace.



PATENTED- MAR. 6, 1906.

J. R. RUSSELL.

FURNACE. APPLICATION FILED JUNE 19, 1905.

2 SHEETS-SHEET 1.

No. 8l4,398. PATENTED MAR. 6, 1906 J. R. RUSSELL.

FURNACE. APPLICATION FILED JUNE 19, 1905.

2 SHEETS-SHBET 2.

witnesses.- In arc/2501".

JOSEPH R. RUSSELL, OF CHICAGO, ILLINOIS.

FURNACE.

Specification of Letters Patent.

Patented March 6, 1906.

Application filed June 19, 1905. Serial No. 265,970.

To all whom it may concern:

Be it knownthat I, JosEPH R. RUssELL, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Furnaces, of which the following is a complete specification.

This invention relates to coke or coal burning furnaces which are used for heating metal for forging, .welding, tempering, and other like purposes.

The object in view is to produce a furnace which shall be compact and simple in construction, efficient and economical in operation, and one that is adapted to burn either small lump fuel or coal and coke screenings.

The preferred construction of the invention is embodied in the accompanying drawings, in which- Figure 1 represents a perspective view of a furnace embodying my improvement, a large portion of the end wall thereof being shown broken away to more clearly reveal the construction of the interior. Fig. 2 is a front elevation of the left-hand side of the furnace. Fig. 3 is a transverse vertical section taken as indicated by the line 3 3 in Fig.

'2, and Fig. 4 represents a fragmentary plan section taken on the line 4 4 of Fig. 2.

In the drawings, 1 designates the anglebars, vertically arranged at each corner of the furnace, these bars forming the frame for the rectangular casing. 2 designates the sheetmetal walls for said casing. The bottom rails 3 are provided to strengthen the base of the casing, and about one-third the height of the furnace from the bottom, secured to the angle-bars 1 and casing-walls 2, is the fire brick support 4. Below this support 4 is the ash-pit 5 and immediately above is the firepot 6. Above the fire-pot 6 is the fuel-receptacle 7, the throat 8 forming a passage-way therebetween. On the rear side of the firebrick support 4'rests the brick lining 9, which extends upwardly, forming the rear wall of the fire-pot 6, the rear wall of the throat 8, and tapering 0H from the upper end of said throat forms also the convergent portion of the rear wall of the fuel-receptacle 7. Similar brick linings 10 rest on the ends of the fire-brick support 4 and form the corresponding end walls of the fire-pot, throat, and bottom of the fuel-receptacle. A modified construction is required for the front wall, however, and this is effected as follows: A large anglebar 11 is fixed upon the front side of the firebrick support 4, the vertical limb thereof being substantially flush with the front side of the furnace. Upon'this angle-bar are supported the fire-bricks which form the front wall 12 of the fire-pot 6. This wall 12 also. forms the hearth on which are placed the articles to be heated, and in conjunction with the fuel in the fire-pot forms the bottom of the heating-compartment 13,which extends forwardly from the upper portion of the firepot. The top wall or arch 14 forms the roof of the said heating-compartment and rests in the end walls 10, as shown in Fig. 2, and is strengthened by means of the arch-clamp 15, the ends of which are embedded in said end walls. The top wall 14 extends rearwardly and forms also the lining for a por tion of the throat 8. To preheat the airblast before it is introduced beneath the firepot 6, a blast-heating chamber 16, consisting of the metal casing, as shown, is provided. This chamber is arranged above the top cover 14 and forms the front wall of the fuelreceptacle. It rests upon the arch-clamp 15, to which it is secured by means of the capscrews 17. An upwardly-projecting portion 14 of the top wall 14in connection with said top wall protects the walls of the chamber 16 from the destructive effect of the heat in the compartment 13 and also from the heated fuel in the throat passage-way 8. The inner face of the-chamber 16 below is provided with an offset 16 to receive the brick lining 14, while above it is beveled to correspond with the tapered portion of the fuel-receptacle 7. An upwardly-projecting flange 18, constructed, preferably, integral with the walls of said heating-chamber and strengthened by the ribs 18, forms the front upper wall of the fuelreceptacle. A detachable cover or lid 16 is secured to the front of the chamber 16 by means of the bolts 19. An opening 20 in.

the end of the heating-chamber 16 receives the end of the blastsupply pipe 21, which is provided with a wind-gate 21. The pipe 22 conducts the heated air from the said chamber to the ash-pit 5, a wind-gate 2 2 regu lating the flow of air therethrough. The air pipe 23, which leads from the blast supply pipe 21 horizontally along beneath the mouth of the heating-compartment 13, has a plurality of orifices 23, through which small flame-retarding currents of air are pro jected against the work being heated in said compartment. A wind-gate 23 regulates the admission of air through said pipe 23.

A closed top 24 with the hinged chargingdoor 24 therein is fitted'to the top of the fuelreceptacle 7. In the wall of the fuel-receptacle, situated just above the termination of the fire-brick lining, is a vent or opening 25,

over Which fits an adjustable slide 26, laterally movable in suitable guides. The function of this vent 25 is to divert a small portion of the escaping products of combustion through the lower part of the fuel-receptacle, thereby effecting a preheating of the fuel therein and enabling better and more efficient results to be obtained in the fire-pot. By varying the degree of opening in the vent 25 the fuel can be preheated an amount which will secure the most efficient results.

The series of chains 27 constitute a movable grate for the lire-pot 6. These chains 27 consist of the links 27, made to hook over the rods 27, which constitute the pivotal axes of said links. Fuel-engaging lugs 27 are provided on the engaging side of the links and the links are alternately disposed. on said rods 27 so the lugs will be arranged in staggered form. The series of chains 27 are mounted upon the rear and front series of sprocket-wheels 28 and 29, respectively. The series of sprocket-wheels 29 are mounted upon and driven by the shaft 30, which journals in suitable bearings secured to the walls of the ash-pit 5. The shaft 31, on which the sprocket-wheels 28 are mounted, journals in the free ends of the arms 32, thesearms pivoting on the shaft 30. This construction results in a swinging frame consisting of the bars or arms 32 and the shaft 3], swinging about the shaft 30 and on which is mounted the movable chain. grate 27. The chain grate is made to advance by means of the hand-wheel 33 on the projecting end of the shaft 30. To support the rear or free ends of the arms 32 and to enable the same to be dropped. for dumping and cleaning the grate, links or levers 34, forming toggle-joints, are secured at each end to the rock-shaft 35, thus providing a fulcrum and support for said links. The rock-shaft 35 is operated. through the hand-lever 36. VVhen the hand-lever is moved forwardly, the toggle-links 34 will occupy the position indicated by the dotted. line 34, the arms 32 the position indicated by the line 32, and the chain grate by the outline 27, in which position the material on top of the grate will be discharged into the ash-pan 38.

To operate the furnace, a fire is started in thefire-pot 6 and the fuel-receptacle 7 is filled and when sufliciently hot the articles to be heated, such as the bar A, is placed within the heating-compartment 13. Having once started, the operation becomes continuous.

The degree of heat can be nicely regulated by means of the wind-gate 22 in the blast-pipe 22, and the vent 25 will enable the initial combustion to begin well up in the throat 8. Most of the flames and products of combustion are discharged through the heating-compartment 13 and escape upwardly along the blast-heating chamber 16, only a very small per cent. being permitted to pass up through the throat of the fuel-receptacle 7. In this manner both the air and fuel are subjected to a preheating effect and very efficient results are obtained. As often as required the handwheel 33 can be given a partial rotation to advance fresh fuel to the front part of the firepot.

The furnace, in effect, consists of a single rectangular casing of practically a uniform cross-section throughout its height, with the base resting upon the floor, the fire-pot arranged intermediate of its length, with the ash-pit below and the fuel-receptacle above said fire-pot. This form of structure renders the furnace very compact, substantial, and with ample space for a large closed ash-pit.

I/Vhat I claim as my invention, and desire to secure by Letters Patent, is

1. In a furnace of the class described, in combination, a closed fuel-receptacle, a firepot located beneath said receptacle, a heating-compartment extending forwardly from the upper portion of said fire-pot, and a blastheating chamber located above said heatingcompartment and arranged to form one of the walls of the said fuel-receptacle.

2. In a furnace of the class described, in combination, a closed fuel-receptacle provided with a throat leading to the fire-pot, a fire-pot located beneath said fuelreceptacle, a heating-compartment extending forwardly from the upper portion of said fire-pot, a metal blast-heating chamber located above said compartment, said chamber forming the front wall of the fuel-receptacle, and firebrick linings interposed. between the top of said compartment and said chamber and between the throat of said fuel-receptacle and said compartment.

3. In a furnace, in combination, a rectangular upright casing of substantially uniform cross-section throughout its height, a bricklined fire-pot intermediate of the length of said casing, a movable chain grate beneath said fire-pot, an ash-pit within said casing and below said fire-pot, a fuel-receptacle above saidfire-pot, a heating-compartment leading forwardly from the upper portion of said fire-pot, and a blast-heating chamber located above said heating-compartment and adjacent to said fuel-receptacle.

JOSEPH R. RUSSELL.

IVitnesses:

MARGARET A. SWEENEY, J. C. WARNEs. 

